diff --git a/lib/tinyusb b/lib/tinyusb
index cf6c534c19..191b73b58c 160000
--- a/lib/tinyusb
+++ b/lib/tinyusb
@@ -1 +1 @@
-Subproject commit cf6c534c1974f4efeb5c136697d1f1028e6aa34a
+Subproject commit 191b73b58c5ad6a098c652f31459ef39078a484b
diff --git a/ports/nrf/usb/usb_msc_flash.c b/ports/nrf/usb/usb_msc_flash.c
index 7972a408b8..384ef55780 100644
--- a/ports/nrf/usb/usb_msc_flash.c
+++ b/ports/nrf/usb/usb_msc_flash.c
@@ -82,8 +82,13 @@ int32_t tud_msc_scsi_cb (uint8_t lun, uint8_t const scsi_cmd[16], void* buffer,
             resplen = 0;
         break;
 
-        // negative means error -> tusb could stall and/or response with failed status
-        default: return -1;
+        default:
+          // Set Sense = Invalid Command Operation
+          tud_msc_set_sense(lun, SCSI_SENSE_ILLEGAL_REQUEST, 0x20, 0x00);
+
+          // negative means error -> tinyusb could stall and/or response with failed status
+          resplen = -1;
+        break;
     }
 
     // return len must not larger than bufsize